Heater



FIG. 1 is a perspective view of a heater embodying the invention;

FIG. 2 is a front view of the heater of FIG. 1;

FIG. 3 is a top view of the heater of FIG. 1;

FIG. 4 is a left side view of the heater of FIG. 1; and,

FIG. 5 is a right side view of the heater of FIG. 1.

The elements shown in broken lines are included for the purpose ofillustrating environment and form no part of the claimed design.

CLAIM We claim the ornamental design for a heater, as shown anddescribed.